﻿/******************************************************************************************************************************

* @ Original idea by by Binny V A, Original version: 2.00.A 
* @ http://www.openjs.com/scripts/events/keyboard_shortcuts/
* @ Original License : BSD
 
* @ jQuery Plugin by Tzury Bar Yochay 
mail: tzury.by@gmail.com
blog: evalinux.wordpress.com
face: facebook.com/profile.php?id=513676303
        
(c) Copyrights 2007
        
* @ jQuery Plugin version Beta (0.0.2)
* @ License: jQuery-License.
 
TODO:
add queue support (as in gmail) e.g. 'x' then 'y', etc.
add mouse + mouse wheel events.

USAGE:
$.hotkeys.add('Ctrl+c', function(){ alert('copy anyone?');});
$.hotkeys.add('Ctrl+c', {target:'div#editor', type:'keyup', propagate: true},function(){ alert('copy anyone?');});>
$.hotkeys.remove('Ctrl+c'); 
$.hotkeys.remove('Ctrl+c', {target:'div#editor', type:'keypress'}); 
    
******************************************************************************************************************************/
(function(jQuery) {
    this.version = '(beta)(0.0.3)';
    this.all = {};
    this.special_keys = {
        27: 'esc', 9: 'tab', 32: 'space', 13: 'return', 8: 'backspace', 145: 'scroll', 20: 'capslock',
        144: 'numlock', 19: 'pause', 45: 'insert', 36: 'home', 46: 'del', 35: 'end', 33: 'pageup',
        34: 'pagedown', 37: 'left', 38: 'up', 39: 'right', 40: 'down', 112: 'f1', 113: 'f2', 114: 'f3',
        115: 'f4', 116: 'f5', 117: 'f6', 118: 'f7', 119: 'f8', 120: 'f9', 121: 'f10', 122: 'f11', 123: 'f12'
    };

    this.shift_nums = { "`": "~", "1": "!", "2": "@", "3": "#", "4": "$", "5": "%", "6": "^", "7": "&",
        "8": "*", "9": "(", "0": ")", "-": "_", "=": "+", ";": ":", "'": "\"", ",": "<",
        ".": ">", "/": "?", "\\": "|"
    };

    this.add = function(combi, options, callback) {
        if (jQuery.isFunction(options)) {
            callback = options;
            options = {};
        }
        var opt = {},
            defaults = { type: 'keydown', propagate: false, disableInInput: false, target: jQuery('html')[0], checkParent: true },
            that = this;
        opt = jQuery.extend(opt, defaults, options || {});
        combi = combi.toLowerCase();

        // inspect if keystroke matches
        var inspector = function(event) {
            event = jQuery.event.fix(event); // jQuery event normalization.
            var element = event.target;
            // @ TextNode -> nodeType == 3
            element = (element.nodeType == 3) ? element.parentNode : element;

            if (opt['disableInInput']) { // Disable shortcut keys in Input, Textarea fields
                var target = jQuery(element);
                if (target.is("input") || target.is("textarea")) {
                    return;
                }
            }
            var code = event.which,
                type = event.type,
                character = String.fromCharCode(code).toLowerCase(),
                special = that.special_keys[code],
                shift = event.shiftKey,
                ctrl = event.ctrlKey,
                alt = event.altKey,
                propagate = true, // default behaivour
                mapPoint = null;

            // in opera + safari, the event.target is unpredictable.
            // for example: 'keydown' might be associated with HtmlBodyElement 
            // or the element where you last clicked with your mouse.
            if (jQuery.browser.opera || jQuery.browser.safari || opt.checkParent) {
                while (!that.all[element] && element.parentNode) {
                    element = element.parentNode;
                }
            }

            var cbMap = that.all[element].events[type].callbackMap;
            if (!shift && !ctrl && !alt) { // No Modifiers
                mapPoint = cbMap[special] || cbMap[character];
            }
            // deals with combinaitons (alt|ctrl|shift+anything)
            else {
                var modif = '';
                if (alt) modif += 'alt+';
                if (ctrl) modif += 'ctrl+';
                if (shift) modif += 'shift+';
                // modifiers + special keys or modifiers + characters or modifiers + shift characters
                mapPoint = cbMap[modif + special] || cbMap[modif + character] || cbMap[modif + that.shift_nums[character]];
            }
            if (mapPoint) {
                mapPoint.cb(event);
                if (!mapPoint.propagate) {
                    event.stopPropagation();
                    event.preventDefault();
                    return false;
                }
            }
        };
        // first hook for this element
        if (!this.all[opt.target]) {
            this.all[opt.target] = { events: {} };
        }
        if (!this.all[opt.target].events[opt.type]) {
            this.all[opt.target].events[opt.type] = { callbackMap: {} };
            jQuery.event.add(opt.target, opt.type, inspector);
        }
        this.all[opt.target].events[opt.type].callbackMap[combi] = { cb: callback, propagate: opt.propagate };
        return jQuery;
    };
    this.remove = function(exp, opt) {
        opt = opt || {};
        target = opt.target || jQuery('html')[0];
        type = opt.type || 'keydown';
        exp = exp.toLowerCase();
        delete this.all[target].events[type].callbackMap[exp];
        return jQuery;
    };
    jQuery.hotkeys = this;
    return jQuery;
})(jQuery);